So new Oculus Integration 1.39 (Unreal 4.22.3) has been released today: https://developer.oculus.com/downloads/package/unreal-engine-4-integration/
Some things on my bugs list have been adresed:
Bug: No Android 64 bits library available for Avatars for Oculus Quest: now available!
Bug: Must disable FFR and multiview when using Vulkan with Quest, thus voiding the Vulkan advantage: now Vulkan works with FFR and Multiview!
These 2 things should speed up Quest frames; I’ll report soon on this.
Also I encourage looking on the blog Developer Perspective: Improving Memory Usage and Load Times in UE4 : https://developer.oculus.com/blog/developer-perspective-improving-memory-usage-and-load-times-in-ue4/ ; some things that could also speed up app.